Carlesbad Caverns, New Mexico - In this National Park beneath the rocky land lies more than 119 known caves, formed from limestone and sulfuric acid. 29 Surreal Places In America You Need To Visit Before You Die
East of Reykjavik lies a mountain named Hengill. Hengill was formed from a Palagomite tuff and its highest point is around 800 metres above sea level. Hengill is a central volcano and has a giant magma chamber beneath it.
Alone rock column mountain (Avatar rocks). Zhangjiajie National Forest Park was officially recognized as a UNESCO World Heritage Site - China - 21 Magnificent Photos That Will Place China On Your Bucket List